| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| What to Do When People Become Difficult: Even if the Difficult Person is You | 978-O-692-21187-8 (O-692-21187-X) | 2015 |
K.P. · K. R. · Kenneth P. · Kenneth R. · Kenneth R. Petrucci · M. K. · M P · M. Petrucci · m r · R. P. · R. Petrucci